Adapter Controls and Connectors
1) M/S Switch
The M (MONO) setting mixes both channels together and
sends the audio to both the right and left channels - which
is ideal when only one microphone is being used. Be sure
to keep the trim control for the unused channel fully
clockwise (yes, clockwise) so that it does not interfere with
the working channel. The S (STEREO) setting keeps both
channels separated and should normally be used when
two mono microphones or a stereo microphone are
connected. This provides two discrete channels of audio.
2) L and R Trim Controls
Each channel has a trim control that attenuates the input
signal from unity to no gain. Since the adapter is passive
you should normally set the trim controls as high as
possible without causing distortion. If necessary, adjust
either the left or right trim control to balance both inputs so
they are of equal amplitude.
Most camcorders and cameras use an automatic gain
control (AGC) to adjust the optimum audio level for
recording. If your camcorder has no way of disabling this
feature, the adapter can still be used to adjust the input
levels but will not override the AGC circuitry.
If your camcorder allows you to switch the AGC off, you
can use this option for manual control over the audio
levels. For the best signal to noise performance, set the
gain on the camera to about 25% of maximum and then
adjust the trim controls on the adapter for the proper level.
As a guide, the recording levels should be no higher than
-12 dBFS (-12 dB below Full Scale).
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